Recording apparatus



April 16, 1935- w. I Aux: ENBAc:|-|v ET A1. 1,997,692

RECORDING APPARATUS F ed June 16, 1950 f ATTORNEY Patented Apr. 16, 1935UNITED STATES PATENT OFFICE i N 1,997,692 aEcoaDmG APPARATUS ApplicationJune 16, 1930, Serial No. 461,274

2 Claims.

Our invention relates to improvements in photo-acoustic apparatus andhas particular relation to recording equipments.

It is an object of our invention to provide a small and compact filmmagazine for a recorder.

According to our invention, we provide, for a photo-acoustic recorder, amagazine wherein the spindles are separated by a distance less than themaximum diameter of a complete lm roll disposed therein.

The novel features' that we consider characteristic of our invention areset forth with particularity in the appended claims. The inventionitself, however, both as to its organization and its method ofoperation, together with addi-- l tional objects and advantages thereof,will best be understood from the following description of a specificembodiment, when read in connectionwith accompanying drawing, in which:

Figure 1 is a view,` in elevation, of a photoacoustic recorderconstructed according to our invention,showing the film-advancingmechaniSmS,

Fig. 2 is a view, in elevation, of the apparatus,

-the rearcover being removed to show the powertr nsmission elements,

g. 3 is a view, in end elevation, of a film magazine constructedaccording to our invention,

Fig. 4 is a view, in section, of a film hub and of 30 a film-tensioningdevice used therewith.

The apparatus shown'in Figs. 1 and 2 comprises, essentially, a magazineI equipped with feeding and take-up spindles 3l and 5, a gear chamber 1,and a chamber 9, provided with a doorl I, wherein a film I3 is advancedand exposed' to the sound-modulated light projected and modified by aplurality of optical elements."

The virgin film I3 is fed from a hub I5 that 40 is centrally positionedon the feeding spindle `3 posed, the film is wound on a hub I1, keyednear one end of the take-up spindle 5, and rotatable therewith. Thetake-up spindle5 is vrotatably suppcrted on a bearing I9, cast integralwith the wall 29 of the magazine I, and has, centrally mounted on itsremaining end, a pulley'2 I, whereby it is rotated from the prime mover22 of the apparatus through a belt (not shown).

The spindles 3 and 5 (Figs. l and 2) are no separated by a distanceequivalent v,to the diameter of the virgin film-roll, in accordance withy the practice taught by the prior art, but are separated by a distanceslightly greater than the and rotatable relative thereto. After beingexmaximum radius of the 111m T011.- .Fllll li'tage is thus taken of thespace available in the magazine. f

Furthermore, by reason of the fact that it is undesirable that themanufacture of the maga- -zine shall be encumbered by the necessity of 5producing a carefully machined oval-shapenpening, the spindles arepositioned on opposite walls and 23 of the magazine, and circularopenings and 21 are milled opposite ythe spindles. Circular plates 29and 3|, threaded to engage the 10 threads cut in the boundaries of theopenings, are provided for preventing the intrusion of light into` themagazine, when the machine is operating, and bosses 33 are provided onthe surface of the plates 29 and 3| for facilitating their po- 15sitioning on the magazine and their removal therefrom.

Finally, a plurality of grooved'bosses 35 are cast integral with ltheWalls of the magazine, wherein a material, such as felt, is disposed toco- 20, act with the virgin film roll to prevent it,v from unwindingunder its own inertia.

To further prevent the film `from choatically accumulating in themagazine, we provide, in the cover 3 I, opposite the feeding spindle adevice for 25 manually tensioning the nlm. The device comprises a pin 31(Fig. 4) having a bushing' 39 coaxially fastened thereto and providedwith a stem 4I and a flange 43 of c-section. The bushing 39 is slidablyVsupported near one surface ofthe magazine cover 3|. It is urged intoengagement with a washer 45, screwed into the surface of the cover, by acompression spring 41 that coacts with a shouldered cup-shape bushing49, slidably supported near the remaining surface ofthe cover andprevented from being projected therefrom by the engagement of theshoulder 5I and the flange 53 in the cover 3|. A pin 55 is fastened tothe flange 43 of the bushing 39 and projects into a clearance hole 51provided for it in the cup-shape 10 bushing 49. Y

The flange bushing 391s axially displaced and` rotated bya knob 59pinned to its stem 4I and the pin 55, disposed therein -is thusprojected through the cup-shape bushing 49 to engage a slot 6I, 45

-milled radially in the feeding hub I5. 'Ihe hub bei' 9 and the gearchamber 1 and is cast integral 55 chamber 'I'he shaft/is rotated fromthe motorA 22 through a metallic coupling |02. Coaxially mounted oir/theshaft and rotatable therewith, are a plln'ality of worms i that coactwith worm wheels |l'l to drive the shafts Il! and through which aplurality of nlm-advancing sprockets ||2 and Ill (in the chamber) arerotated.

Thenlm ilisdrawnfromthefeedlng spindle and is delivered to the take-upspindle by one sprocket I 2, while a second sprocket III, rotated fromits shaft through a ilexible coupling (not shown), advances the illxnover a roller ||l and rotates the roller.

Theroller Iliispinned toone endofthe shaft |2| that is rotatably mountedin a bearing pro- Iiecting from the vertical supporting plate I of themoving mec, and a flywheel |23 is centrally supported on theremainingend of the shaft to rotate therewith. The flexibly drivensprocket III and the ilywheel |22 cooperate to maintain the lm inuniform motion.

The elements of recording the optical system are mounted on a platform2l2 disposed adjacent to the chamber I.

The optical system comprises a lamp (not shown). a lens 2|2, masked byan aperture 2|l, a galvanometer 2 I1, wherein a mirror (not shown) issuspended, by two metallic ribbons, between the poles of the magnet anda plurality of lenses and a slit mounted in a cylindrical opening (notshown) in a bracket 22| supported on the platform 202. 'I 'he parts ofthe galvanometer do not concern the present invention and areconsequently, notH shown in detail.

In the practice of our invention, light from the source is projected onthe galvanometer mirror and after being reflected therefrom, istransmittain specific embodiment of our invention, we are l fully awarethat many modifications thereof are possible. Our invention, therefore.is not `to be restricted except insofar n is necessitated b'y the priorart and by the spirit of the appended claims.

We claim as our invention:

1. A nlm magazine comprising enclosure,

and a plurality of spindles mounted within said enclosure, the distancebetween said spindles being less than the diameter of a illm roll to besupported on one of said spindles, a plurality of openings in saidenclosure, said openings being disposed in opposite walls of saidenclosure and means for closing said openings.

2. A nlm magazine comprising an enclosure, having openings in oppositewalls thereof, a plurality of spindles mounted within said enclosure anda plurality of hubs to support a nlm roll mounted on said spindles, saidmagazine being of the type wherein the nlm roll is coaxially supportedon the hub mounted on one spindle and is unwound therefrom onto the hubmounted on another spindle; characterized by that said spindles are sodisposed in said enclosure that the minimum distance between thelperipheries of said -hubs is substantially equivalent to the differencebetween the outer radius of the largest nlmrollthatistobeutilizedinsaidmagazineandthe radius of one of said hubs.

W. LAUDENBACH. FRANCIS E. HIRNDON

